Pub Date : 2025-07-26DOI: 10.1016/j.oceram.2025.100831
Shigefumi Matsumoto , Katsumi Morikawa , Koji Goda , Kiyoshi Goto , Hiroyuki Fukuyama
Understanding local corrosion mechanisms of ZrO₂-C (ZG) refractories is essential for extending submerged entry nozzle (SEN) lifespan and improving continuous casting efficiency. This study and analytically investigated local corrosion of ZG refractories at the slag/metal interface, where molten steel contacts mold fluxes. Refractory wettability significantly affects ZrO₂ content and corrosion rate. To elucidate these interactions, we developed a model focused on the slag/metal interface, incorporating a two-dimensional cellular automaton (CA) method. Using actual ZG microstructures, the CA simulation visualized corrosion behavior, revealing new insights. Despite considering only wettability changes, the model successfully replicated (1) observed correlations between ZrO₂ content and corrosion rate, and (2) time-dependent changes in corrosion depth and ZrO₂ area fraction. These results were achieved for critical ZrO₂ area fractions , , and in ZG refractories containing 79 and 86 wt.% ZrO₂. Findings support optimization of refractory design and process parameters.
{"title":"Cellular automaton modeling of the local corrosion of ZrO2-C refractories at slag/metal interfaces","authors":"Shigefumi Matsumoto , Katsumi Morikawa , Koji Goda , Kiyoshi Goto , Hiroyuki Fukuyama","doi":"10.1016/j.oceram.2025.100831","DOIUrl":"10.1016/j.oceram.2025.100831","url":null,"abstract":"<div><div>Understanding local corrosion mechanisms of ZrO₂-C (ZG) refractories is essential for extending submerged entry nozzle (SEN) lifespan and improving continuous casting efficiency. This study and analytically investigated local corrosion of ZG refractories at the slag/metal interface, where molten steel contacts mold fluxes. Refractory wettability significantly affects ZrO₂ content and corrosion rate. To elucidate these interactions, we developed a model focused on the slag/metal interface, incorporating a two-dimensional cellular automaton (CA) method. Using actual ZG microstructures, the CA simulation visualized corrosion behavior, revealing new insights. Despite considering only wettability changes, the model successfully replicated (1) observed correlations between ZrO₂ content and corrosion rate, and (2) time-dependent changes in corrosion depth and ZrO₂ area fraction. These results were achieved for critical ZrO₂ area fractions <span><math><mrow><msub><mi>f</mi><mtext>Zc</mtext></msub><mo>=</mo><mn>0.01</mn></mrow></math></span>, <span><math><mrow><mn>0.15</mn></mrow></math></span>, and <span><math><mrow><mn>0.50</mn></mrow></math></span> in ZG refractories containing 79 and 86 wt.% ZrO₂. Findings support optimization of refractory design and process parameters.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"23 ","pages":"Article 100831"},"PeriodicalIF":2.8,"publicationDate":"2025-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144724737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-24DOI: 10.1016/j.oceram.2025.100830
Byoungjin So, Jae Won Lee, Chang Hwa Lee, Jae Soo Ryu, Hwan-Seo Park
We report a method that uses an additively-manufactured sacrificial mold to fabricate ceramic cellular structures that have a gyroid geometry. The mold has a complex periodic architecture, and was produced by additive manufacturing that applies fused deposition modelling, then a ceramic slurry was infiltrated into its cavity by centrifugation. This approach enables fabrication of geometrically-elaborate ceramic shapes such as gyroid by using low-cost and accessible equipment. The resulting gyroid filter had good mechanical integrity and good ability to capture gaseous cesium. The proposed method allows structural optimization of the filter, and tunable capture characteristics.
{"title":"Gyroid ceramic cellular filter using an additively-manufactured sacrificial mold toward off-gas management","authors":"Byoungjin So, Jae Won Lee, Chang Hwa Lee, Jae Soo Ryu, Hwan-Seo Park","doi":"10.1016/j.oceram.2025.100830","DOIUrl":"10.1016/j.oceram.2025.100830","url":null,"abstract":"<div><div>We report a method that uses an additively-manufactured sacrificial mold to fabricate ceramic cellular structures that have a gyroid geometry. The mold has a complex periodic architecture, and was produced by additive manufacturing that applies fused deposition modelling, then a ceramic slurry was infiltrated into its cavity by centrifugation. This approach enables fabrication of geometrically-elaborate ceramic shapes such as gyroid by using low-cost and accessible equipment. The resulting gyroid filter had good mechanical integrity and good ability to capture gaseous cesium. The proposed method allows structural optimization of the filter, and tunable capture characteristics.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"23 ","pages":"Article 100830"},"PeriodicalIF":2.8,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144720799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-23DOI: 10.1016/j.oceram.2025.100829
Christian Molin, Zhenglyu Li, Sylvia E. Gebhardt
In this paper, we report on multilayer ceramic components based on (BSSnT) with addition or modification for electrocaloric (EC) cooling applications. The influence of sintering parameters on grain size, dielectric and EC properties are investigated. In components with addition we could increase grain size from 0.4 µm to 4.6 µm by adapting sintering parameters. With increasing grain size dielectric strength is reduced, thus limiting EC properties. In BSSnT components modified with , grain size was increased from 1.7 µm to 6.6 µm, resulting in an increase of EC temperature change from 0.76 K to 0.94 K under an electric field change of 14 V µm−1. Simultaneously, dielectric strength decreases from 31.6 V µm−1 to 21.5 V µm−1. Therefore, the optimal grain size represents a compromise between a moderate EC effect and a moderate dielectric strength, since both properties show an opposite dependence on grain size.
{"title":"Lead-free (Ba,Sr)(Sn,Ti)O3 multilayer ceramic components for electrocaloric application","authors":"Christian Molin, Zhenglyu Li, Sylvia E. Gebhardt","doi":"10.1016/j.oceram.2025.100829","DOIUrl":"10.1016/j.oceram.2025.100829","url":null,"abstract":"<div><div>In this paper, we report on multilayer ceramic components based on <span><math><mrow><mi>B</mi><msub><mi>a</mi><mrow><mn>0.82</mn></mrow></msub><mi>S</mi><msub><mi>r</mi><mrow><mn>0.18</mn></mrow></msub><mi>S</mi><msub><mi>n</mi><mrow><mn>0.065</mn></mrow></msub><mi>T</mi><msub><mi>i</mi><mrow><mn>0.935</mn></mrow></msub><msub><mi>O</mi><mn>3</mn></msub></mrow></math></span> (BSSnT) with <span><math><mtext>MgO</mtext></math></span> addition or <span><math><mtext>Ca</mtext></math></span> modification for electrocaloric (EC) cooling applications. The influence of sintering parameters on grain size, dielectric and EC properties are investigated. In components with <span><math><mtext>MgO</mtext></math></span> addition we could increase grain size from 0.4 µm to 4.6 µm by adapting sintering parameters. With increasing grain size dielectric strength is reduced, thus limiting EC properties. In BSSnT components modified with <span><math><mtext>Ca</mtext></math></span>, grain size was increased from 1.7 µm to 6.6 µm, resulting in an increase of EC temperature change from 0.76 K to 0.94 K under an electric field change of 14 V µm<sup>−1</sup>. Simultaneously, dielectric strength decreases from 31.6 V µm<sup>−1</sup> to 21.5 V µm<sup>−1</sup>. Therefore, the optimal grain size represents a compromise between a moderate EC effect and a moderate dielectric strength, since both properties show an opposite dependence on grain size.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"23 ","pages":"Article 100829"},"PeriodicalIF":2.9,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144704842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study employed the green synthesis approach to produce Selenium nanoparticles (Se-NPs) using Valeriana officinalis (Valerian) root extract as a biological agent for reduction and stabilization. The phytochemicals present in the extract enabled the generation of stable Se-NPs without the use of toxic chemicals. The nanoparticles underwent extensive characterization using UV–Vis spectroscopy, XRD, FTIR, and TEM images, confirming their structural, morphological, and surface properties. The Se-NPs demonstrated photocatalytic performance, which was confirmed by the efficient photodegradation of Rhodamine B (RhB) dye (98 % after 150 min). Furthermore, biological assays revealed that the nanoparticles exhibited selective cytotoxicity toward cancer B16F0 cells. This dual functionality, photocatalytic degradation, and selective anticancer effect highlight the applicability of Se-NPs in environmental and biomedical fields.
{"title":"Biogenic synthesis of selenium nanoparticles from Valeriana officinalis extract: A dual approach for environmental remediation and cancer therapy","authors":"Fatemeh Nazarzadeh , Saied Navabpour , Zahra Sabouri , Majid Darroudi","doi":"10.1016/j.oceram.2025.100828","DOIUrl":"10.1016/j.oceram.2025.100828","url":null,"abstract":"<div><div>This study employed the green synthesis approach to produce Selenium nanoparticles (Se-NPs) using <em>Valeriana officinalis</em> (<em>Valerian</em>) root extract as a biological agent for reduction and stabilization. The phytochemicals present in the extract enabled the generation of stable Se-NPs without the use of toxic chemicals. The nanoparticles underwent extensive characterization using UV–Vis spectroscopy, XRD, FTIR, and TEM images, confirming their structural, morphological, and surface properties. The Se-NPs demonstrated photocatalytic performance, which was confirmed by the efficient photodegradation of Rhodamine B (RhB) dye (98 % after 150 min). Furthermore, biological assays revealed that the nanoparticles exhibited selective cytotoxicity toward cancer B16F0 cells. This dual functionality, photocatalytic degradation, and selective anticancer effect highlight the applicability of Se-NPs in environmental and biomedical fields.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"23 ","pages":"Article 100828"},"PeriodicalIF":2.8,"publicationDate":"2025-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144724736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-19DOI: 10.1016/j.oceram.2025.100827
Sakhavat Dadashov , Ender Suvaci
In this study, a two-step hydrothermal synthesis method involving the development of a precursor interphase and its conversion into multifunctional BaTiO₃ nanowires was employed. Na₂Ti₃O₇ powders were developed as the precursor intermediate phase, and the synthesis conditions were optimized by investigating the effects of experimental parameters such as the NaOH:TiO₂ mole ratio, reaction temperature, and stirring rate on the structure and phase composition of the precursor. By adjusting the experimental parameters, the precursor intermediate phase with the desired phase composition and nanowire morphology was successfully obtained. It was observed that varying the NaOH:TiO₂ ratio from 2:1 to 64:1 had a significant impact on the phase development and morphology of the intermediate phase. The precursor intermediate phase was successfully converted into BaTiO₃ nanowires via a second hydrothermal reaction. XRD, SEM, EDX, TG and FTIR analyses confirmed that obtained BaTiO3 nanowires had a high aspect ratio and single-phase composition.
{"title":"Optimization of Na2Ti3O7 nanowire synthesis conditions for reliable BaTiO3 nanowires production","authors":"Sakhavat Dadashov , Ender Suvaci","doi":"10.1016/j.oceram.2025.100827","DOIUrl":"10.1016/j.oceram.2025.100827","url":null,"abstract":"<div><div>In this study, a two-step hydrothermal synthesis method involving the development of a precursor interphase and its conversion into multifunctional BaTiO₃ nanowires was employed. Na₂Ti₃O₇ powders were developed as the precursor intermediate phase, and the synthesis conditions were optimized by investigating the effects of experimental parameters such as the NaOH:TiO₂ mole ratio, reaction temperature, and stirring rate on the structure and phase composition of the precursor. By adjusting the experimental parameters, the precursor intermediate phase with the desired phase composition and nanowire morphology was successfully obtained. It was observed that varying the NaOH:TiO₂ ratio from 2:1 to 64:1 had a significant impact on the phase development and morphology of the intermediate phase. The precursor intermediate phase was successfully converted into BaTiO₃ nanowires via a second hydrothermal reaction. XRD, SEM, EDX, TG and FTIR analyses confirmed that obtained BaTiO<sub>3</sub> nanowires had a high aspect ratio and single-phase composition.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"23 ","pages":"Article 100827"},"PeriodicalIF":2.8,"publicationDate":"2025-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144720798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Despite broad utilization of zirconia ceramics in science and industry, significant matters about the structure-property relations in sintered parts are relevant. In this work, to control the microstructure of doped zirconium oxide ceramics with Y, Ca, Mg, Ce dopants sintering at temperatures in the range of 1300 - 1700 °C was carried out. The structure-property relation was studied using XRD, SEM, Vickers and measuring the biaxial flexural strength methods. With an increase in the sintering temperature, significant changes in the microstructure are observed, associated with exaggerated grain growth and the formation of secondary phases. Microhardness vs sintering temperature dependencies show that with increasing temperature, there is an increase in the HV1 values for the ZrO2CaCO3, ZrO2−MgO, ZrO2-CeO2 compositions, which is associated with an increase in the density of ceramics. Optimum sintering temperatures for ZrO2-Y2O3, ZrO2−MgO compositions were found, for which the flexural strengths have the highest values.
{"title":"Study of the effect of sintering temperature on the microstructure and mechanical properties of stabilized and partially stabilized zirconium dioxide","authors":"D.B. Borgekov , R.I. Shakirzyanov , M.E. Kaliekperov , Yu.A. Garanin , S.A. Maznykh , D.I. Shlimas","doi":"10.1016/j.oceram.2025.100826","DOIUrl":"10.1016/j.oceram.2025.100826","url":null,"abstract":"<div><div>Despite broad utilization of zirconia ceramics in science and industry, significant matters about the structure-property relations in sintered parts are relevant. In this work, to control the microstructure of doped zirconium oxide ceramics with Y, Ca, Mg, Ce dopants sintering at temperatures in the range of 1300 - 1700 °C was carried out. The structure-property relation was studied using XRD, SEM, Vickers and measuring the biaxial flexural strength methods. With an increase in the sintering temperature, significant changes in the microstructure are observed, associated with exaggerated grain growth and the formation of secondary phases. Microhardness vs sintering temperature dependencies show that with increasing temperature, there is an increase in the HV1 values for the ZrO<sub>2<img></sub>CaCO<sub>3</sub>, ZrO<sub>2</sub>−MgO, ZrO2-CeO<sub>2</sub> compositions, which is associated with an increase in the density of ceramics. Optimum sintering temperatures for ZrO2-Y<sub>2</sub>O<sub>3</sub>, ZrO<sub>2</sub>−MgO compositions were found, for which the flexural strengths have the highest values.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"23 ","pages":"Article 100826"},"PeriodicalIF":2.9,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144663259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-15DOI: 10.1016/j.oceram.2025.100825
Abel W. Ourgessa , Ahmed Gamal Abd-Elsatar , Mokhtar Mahmoud , Hamada Elsayed , Jozef Kraxner , Dusan Galusek , Enrico Bernardo
This study explores the upcycling of glass waste into sustainable materials using additive manufacturing. The direct ink writing technique was used to 3D print structures from waste fiberglass activated with 3 M or 5 M NaOH. All inks showed shear-thinning behavior after 3 h of mixing, ensuring good printability. Printed structure with 5 M NaOH achieved higher compressive strength (5.2 MPa). Incorporation of glass microsphere fillers, synthesized from waste soda-lime glass via flame synthesis, improved print quality and reduced density. The printed structures displayed good layer adhesion and defect-free morphology. Thermal treatment at 800 °C produced porous glass ceramics with a foaming effect. Low molarity and microsphere incorporation minimized foaming while preserving the 3D structure. Final products had porosities of 88–93 %, bulk densities of 0.17–0.3 g/cm³, and compressive strengths of 1.6–3.2 MPa, demonstrating their potential as lightweight, sustainable building materials.
本研究探讨了利用增材制造将玻璃废料升级为可持续材料的方法。利用直接墨水书写技术，利用3 M或5 M NaOH活化的废玻璃纤维进行3D打印结构。混合3 h后，所有油墨都表现出剪切变薄的行为，保证了良好的印刷适性。5 M NaOH的印刷结构具有较高的抗压强度（5.2 MPa）。加入由废钠石灰玻璃通过火焰合成合成的玻璃微球填料，提高了印刷质量，降低了密度。打印结构具有良好的层附着性和无缺陷形貌。在800°C下热处理产生多孔玻璃陶瓷，具有发泡效果。低摩尔浓度和微球掺入最小化发泡，同时保留三维结构。最终产品的孔隙率为88 - 93%，容重为0.17-0.3 g/cm³，抗压强度为1.6-3.2 MPa，显示出其作为轻质可持续建筑材料的潜力。
{"title":"Direct ink writing of lightweight 3D structures from alkali-activated waste fiberglass and glass microsphere fillers","authors":"Abel W. Ourgessa , Ahmed Gamal Abd-Elsatar , Mokhtar Mahmoud , Hamada Elsayed , Jozef Kraxner , Dusan Galusek , Enrico Bernardo","doi":"10.1016/j.oceram.2025.100825","DOIUrl":"10.1016/j.oceram.2025.100825","url":null,"abstract":"<div><div>This study explores the upcycling of glass waste into sustainable materials using additive manufacturing. The direct ink writing technique was used to 3D print structures from waste fiberglass activated with 3 M or 5 M NaOH. All inks showed shear-thinning behavior after 3 h of mixing, ensuring good printability. Printed structure with 5 M NaOH achieved higher compressive strength (5.2 MPa). Incorporation of glass microsphere fillers, synthesized from waste soda-lime glass via flame synthesis, improved print quality and reduced density. The printed structures displayed good layer adhesion and defect-free morphology. Thermal treatment at 800 °C produced porous glass ceramics with a foaming effect. Low molarity and microsphere incorporation minimized foaming while preserving the 3D structure. Final products had porosities of 88–93 %, bulk densities of 0.17–0.3 g/cm³, and compressive strengths of 1.6–3.2 MPa, demonstrating their potential as lightweight, sustainable building materials.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"23 ","pages":"Article 100825"},"PeriodicalIF":2.9,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144663258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-06DOI: 10.1016/j.oceram.2025.100820
S. Udovenko , R. Graham , P. Tipsawat , M. Pineda , S. Trolier-McKinstry
Piezoelectric micromachined ultrasonic transducers (PMUTs) enable substantial electrically induced strains at low voltages. In this work a combination of Laser Doppler Vibrometry (LDV) and Mapping Single Beam Laser Interferometry (SBLI) was used to characterize PMUT displacement shapes at frequencies of 600 kHz and 1 kHz, respectively. Finite element modeling demonstrated excellent agreement with the displacements, once the device geometry was corrected to measured (rather than nominal) dimensions and appropriate boundary conditions were applied. Mapping SBLI was also used to characterize mechanical crosstalk at low frequencies, which is critical for evaluating PMUT performance. It was also demonstrated that driving one element induces bending of the PMUT substrate over dimensions on the 3 mm scale. The analysis of displacement profiles near the edges of released parts of PMUT structure revealed 150 μm transition regions between clamped and released areas. This reduced the active length (where displacement reaches its maximum values) of the PMUT by ∼4%.
{"title":"Surface displacements of a PMUT array: Interferometric characterization and mechanical crosstalk evaluation","authors":"S. Udovenko , R. Graham , P. Tipsawat , M. Pineda , S. Trolier-McKinstry","doi":"10.1016/j.oceram.2025.100820","DOIUrl":"10.1016/j.oceram.2025.100820","url":null,"abstract":"<div><div>Piezoelectric micromachined ultrasonic transducers (PMUTs) enable substantial electrically induced strains at low voltages. In this work a combination of Laser Doppler Vibrometry (LDV) and Mapping Single Beam Laser Interferometry (SBLI) was used to characterize PMUT displacement shapes at frequencies of 600 kHz and 1 kHz, respectively. Finite element modeling demonstrated excellent agreement with the displacements, once the device geometry was corrected to measured (rather than nominal) dimensions and appropriate boundary conditions were applied. Mapping SBLI was also used to characterize mechanical crosstalk at low frequencies, which is critical for evaluating PMUT performance. It was also demonstrated that driving one element induces bending of the PMUT substrate over dimensions on the 3 mm scale. The analysis of displacement profiles near the edges of released parts of PMUT structure revealed 150 μm transition regions between clamped and released areas. This reduced the active length (where displacement reaches its maximum values) of the PMUT by ∼4%.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"23 ","pages":"Article 100820"},"PeriodicalIF":2.9,"publicationDate":"2025-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144632282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-06DOI: 10.1016/j.oceram.2025.100824
Amine el Mahdi Safhi , Shima Pilehvar , Mahdi Kioumarsi
Dredging worldwide generates over 1 billion m³ of sediments annually, creating disposal and environmental challenges. Alkali-activated materials (AAMs) offer a circular pathway by converting dredged sediments (DS) into sustainable binders and aggregates. This review synthesizes 32 studies on DS-based AAMs, detailing sediments chemistry, pretreatment routes, mix-design strategies, performance, and field cases. Calcination or mechanochemical activation elevates DS reactivity, producing binders that achieve 28-day compressive strengths of 15–40 MPa and durable matrices resistant to sulfate, freeze–thaw, and carbonation. Processed DS sands can fully or partially replace natural fine aggregates while maintaining ≥25 MPa concrete strength. AAM matrices immobilize heavy metals, keeping leachate below inert-waste thresholds. Key knowledge gaps remain in standardized mix design, long-term durability, and regulatory acceptance. The review outlines research and policy priorities to scale DS-AAM technologies for low-carbon infrastructure.
{"title":"Review of advances and challenges in alkali-activated materials from dredged sediments","authors":"Amine el Mahdi Safhi , Shima Pilehvar , Mahdi Kioumarsi","doi":"10.1016/j.oceram.2025.100824","DOIUrl":"10.1016/j.oceram.2025.100824","url":null,"abstract":"<div><div>Dredging worldwide generates over 1 billion m³ of sediments annually, creating disposal and environmental challenges. Alkali-activated materials (AAMs) offer a circular pathway by converting dredged sediments (DS) into sustainable binders and aggregates. This review synthesizes 32 studies on DS-based AAMs, detailing sediments chemistry, pretreatment routes, mix-design strategies, performance, and field cases. Calcination or mechanochemical activation elevates DS reactivity, producing binders that achieve 28-day compressive strengths of 15–40 MPa and durable matrices resistant to sulfate, freeze–thaw, and carbonation. Processed DS sands can fully or partially replace natural fine aggregates while maintaining ≥25 MPa concrete strength. AAM matrices immobilize heavy metals, keeping leachate below inert-waste thresholds. Key knowledge gaps remain in standardized mix design, long-term durability, and regulatory acceptance. The review outlines research and policy priorities to scale DS-AAM technologies for low-carbon infrastructure.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"23 ","pages":"Article 100824"},"PeriodicalIF":2.9,"publicationDate":"2025-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144587969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-05DOI: 10.1016/j.oceram.2025.100822
Guo Feng , Tiantian Liu , Jun Mu , Feng Jiang , Zhiqi Guo , Liangliang Xiao , Qian Wu , Xiaojun Zhang , Jianmin Liu , Jian Liang
Novel Co and Cr free, high-temperature (Ni, Mn) co-doping CuFe5O8 black ceramic pigments were synthesized. The effects of mineralizer type and mineralizer amount on the synthesis and coloration of (Ni, Mn) co-doping CuFe5O8 pigments, as well as the effect of glazing calcination temperature on glaze coloration were systematically investigated using testing and characterization methods such as XRD, FE-SEM, TEM, EDS-mapping, HAADF and colorimeter. The results indicate that compared with H3BO3, NH4F, LiF and NaF mineralizers, the pigment with MgO as the mineralizer is relatively better. The optimized mineralizer MgO amount is 6.25 wt.% (mass ratio relative to the pigment). L*, a* and b* values of corresponding optimized pigment are 21.36, 1.10 and -0.24, respectively. The crystal phase of the pigment is CuFe5O8 (73–2314), and no diffraction peak of the heterophase is detected. The crystal size of the pigments is 0.8–1.5 μm with excellent dispersivity. The glazing temperatures have little effect on the coloration of the pigments when they are used at 1000 °C, 1150 °C and 1300 °C. The results show that the pigment has excellent high temperature resistance and is expected to be widely used in high-temperature glazing coloration.
{"title":"Effect of mineralizer on the synthesis of (Ni, Mn) co-doping CuFe5O8 pigment and its glazing performance","authors":"Guo Feng , Tiantian Liu , Jun Mu , Feng Jiang , Zhiqi Guo , Liangliang Xiao , Qian Wu , Xiaojun Zhang , Jianmin Liu , Jian Liang","doi":"10.1016/j.oceram.2025.100822","DOIUrl":"10.1016/j.oceram.2025.100822","url":null,"abstract":"<div><div>Novel Co and Cr free, high-temperature (Ni, Mn) co-doping CuFe<sub>5</sub>O<sub>8</sub> black ceramic pigments were synthesized. The effects of mineralizer type and mineralizer amount on the synthesis and coloration of (Ni, Mn) co-doping CuFe<sub>5</sub>O<sub>8</sub> pigments, as well as the effect of glazing calcination temperature on glaze coloration were systematically investigated using testing and characterization methods such as XRD, FE-SEM, TEM, EDS-mapping, HAADF and colorimeter. The results indicate that compared with H<sub>3</sub>BO<sub>3</sub>, NH<sub>4</sub>F, LiF and NaF mineralizers, the pigment with MgO as the mineralizer is relatively better. The optimized mineralizer MgO amount is 6.25 wt.% (mass ratio relative to the pigment). <em>L</em>*, <em>a</em>* and <em>b</em>* values of corresponding optimized pigment are 21.36, 1.10 and -0.24, respectively. The crystal phase of the pigment is CuFe<sub>5</sub>O<sub>8</sub> (73–2314), and no diffraction peak of the heterophase is detected. The crystal size of the pigments is 0.8–1.5 <em>μ</em>m with excellent dispersivity. The glazing temperatures have little effect on the coloration of the pigments when they are used at 1000 °C, 1150 °C and 1300 °C. The results show that the pigment has excellent high temperature resistance and is expected to be widely used in high-temperature glazing coloration.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"23 ","pages":"Article 100822"},"PeriodicalIF":2.9,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144579789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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